The generic function pane-initial-focus
returns the child of
pane-with-children
that has the input focus when
pane-with-children
is first displayed.
(setf pane-initial-focus)
may be used to set the initial focus pane, but only before
pane-with-children
has been created. If the setter is called after
pane-with-children
has been created, an error is signalled.
pane-with-children should be a pane with child panes such as a layout, an interface, a button-panel or a toolbar.
CAPI User Guide and Reference Manual (Macintosh version) - 3 Aug 2017